Chevrolet 1970 Owner's Manual page 27

Heater
Push the AIR-FAN lever to the
right to "AIR" to allow outside air
into the vehicle. Further movement
of the lever operates the low, medium
and high speeds of the fan.
Adjust TEMPERATURE (Center)
lever as required to give the desired
degree of heat. Full right position pro-
vides maximum heat.
Move the DEFROSTER lever to the
right (De-Ice) when windshield de-
frosting is needed. Full right position
diverts almost all air flow to the de-
froster. Vary TEMPERATURE lever
as required. With the defroster lever
in the OFF position, air is directed out
the floor (heater) outlets.
The windshield defrosting and de-
fogging system assists in providing
good visibility through designated
areas of the windshield under most
inclement weather conditions. For
immediate operation of the vehicle,
the windshield should be scraped
clear.
CAUTION: In inclement weather, clear
snow or ice from cowl air Inlets. This will
improve heater and defroster efflc/ency
and reduce formation of fog or frost on
the inside of the windshield during initial
operation under certain atmospheric con-
ditions. Also, clear the windshield, rear
window, outside mirrors and all side win-
dows of ice or snow prior to operation of
the vehicle. This will improve driver's vi-
sion during initial operation.
24
Heater Operating Tips
Always brush snow from the hood
and air inlet in front of the windshield
before operating the heater.
Keep all windows and vents closed
to eliminate dust, road and wind noise
and uncomfortable drafts.
For most satisfactory heater opera-
tion and air circulation, operate fan
on low or medium speeds for normal
operation and high speed for quick
warm-up and during extremely low
temperatures.
For adequate rear seat heating, the
area beneath the front seat must not
be blocked by carpeting, rags, paper
or other material.
For additional summer ventilation
move the DEFROSTER and AIR
levers to fully open and operate- the
fan as desired.
Operate system for 30 seconds be-
fore switching to "DE-ICE". This will
remove humid air from the system
and minimize rapid fogging of the
glass which can occur if humid air
is blown onto a cool windshield.